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In page Sakhalin:

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The Jesuits did not have a chance to visit the island, and the geographical information provided by the Nanai people and Manchus who had been to the island was insufficient to allow them to identify it as the land visited by de Vries in 1643. As a result, many 17th-century maps showed a rather strangely shaped Sakhalin, which included only the northern half of the island (with Cape Patience), while Cape Aniva, discovered by de Vries, and the "Black Cape" (Cape Crillon) were thought to form part of the mainland.[citation needed]